Returning undefined is enough, when a registry entry is not found.
Returning undefined is enough, when a registry entry is not found.

andene/substance,stencila/substance,podviaznikov/substance,michael/substance-1,jacwright/substance,GerHobbelt/substance,jacwright/substance,abhaga/substance,podviaznikov/substance,substance/substance,DuncanAForbes/substance,substance/substance,abhaga/substance,TypesetIO/substance,andene/substance,DuncanAForbes/substance,michael/substance-1,TypesetIO/substance,GerHobbelt/substance